I'm currently watching Transfomers and it would be Optimus Prime's "Autobots: Roll out!"
And of course, Skyrims "... took an arrow to the knee."
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I seriously want to murder that guy when I hear him say "Have you ever been to the cloud district? Oh who am I kidding, of course you haven't"
And the "Someone stole your sweetroll?"
But as for the best battle cry would have to be the WAAAGH from the Orks in Warhammer 40k